During his tenure in Boston patrolling left field, Fenway Park featured a ten-foot-high mound that formed an incline in front of the left field wall, now better known as the Green Monster. The young outfielder mastered the incline to such an extent that it was nicknamed "Duffy's Cliff". Sports cartoons of the period often depicted him as a mountain climber making catches amid sheep and snowcaps. The mound was eventually reduced in 1934, long after Lewis had left the Sox, and was not completely eliminated until the field underwent a major renovation following the 2004 season.